docstring fixups, closes pandas-dev#26982

Author: jbrockmendel

pandas/_libs/tslibs/offsets.pyx

@@ -219,7 +219,9 @@ cdef _wrap_timedelta_result(result):
 
 
 cdef _get_calendar(weekmask, holidays, calendar):
-    """Generate busdaycalendar"""
+    """
+    Generate busdaycalendar
+    """
     if isinstance(calendar, np.busdaycalendar):
         if not holidays:
             holidays = tuple(calendar.holidays)
@@ -659,14 +661,18 @@ cdef class BaseOffset:
         return nint
 
     def __setstate__(self, state):
-        """Reconstruct an instance from a pickled state"""
+        """
+        Reconstruct an instance from a pickled state
+        """
         self.n = state.pop("n")
         self.normalize = state.pop("normalize")
         self._cache = state.pop("_cache", {})
         # At this point we expect state to be empty
 
     def __getstate__(self):
-        """Return a pickleable state"""
+        """
+        Return a pickleable state
+        """
         state = {}
         state["n"] = self.n
         state["normalize"] = self.normalize
@@ -971,7 +977,9 @@ cdef class RelativeDeltaOffset(BaseOffset):
             object.__setattr__(self, key, val)
 
     def __getstate__(self):
-        """Return a pickleable state"""
+        """
+        Return a pickleable state
+        """
         # RelativeDeltaOffset (technically DateOffset) is the only non-cdef
         #  class, so the only one with __dict__
         state = self.__dict__.copy()
@@ -980,7 +988,9 @@ cdef class RelativeDeltaOffset(BaseOffset):
         return state
 
     def __setstate__(self, state):
-        """Reconstruct an instance from a pickled state"""
+        """
+        Reconstruct an instance from a pickled state
+        """
 
         if "offset" in state:
             # Older (<0.22.0) versions have offset attribute instead of _offset
@@ -3604,7 +3614,9 @@ def shift_day(other: datetime, days: int) -> datetime:
 
 
 cdef inline int year_add_months(npy_datetimestruct dts, int months) nogil:
-    """new year number after shifting npy_datetimestruct number of months"""
+    """
+    New year number after shifting npy_datetimestruct number of months.
+    """
     return dts.year + (dts.month + months - 1) // 12
 
 
@@ -3702,7 +3714,9 @@ cdef inline void _shift_months(const int64_t[:] dtindex,
                                Py_ssize_t count,
                                int months,
                                str day_opt) nogil:
-    """See shift_months.__doc__"""
+    """
+    See shift_months.__doc__
+    """
     cdef:
         Py_ssize_t i
         int months_to_roll
@@ -3734,7 +3748,9 @@ cdef inline void _shift_quarters(const int64_t[:] dtindex,
                                  int q1start_month,
                                  str day_opt,
                                  int modby) nogil:
-    """See shift_quarters.__doc__"""
+    """
+    See shift_quarters.__doc__
+    """
     cdef:
         Py_ssize_t i
         int months_since, n
@@ -3990,7 +4006,9 @@ cdef inline int _roll_qtrday(npy_datetimestruct* dts,
                              int n,
                              int months_since,
                              str day_opt) nogil except? -1:
-    """See roll_qtrday.__doc__"""
+    """
+    See roll_qtrday.__doc__
+    """
 
     if n > 0:
         if months_since < 0 or (months_since == 0 and